Furnace Blowing Cold Air On Heat

Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building. If you only feel your furnace blowing cold air briefly and the air is quickly replaced by warm air this is the most likely explanation.

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If your ducts have cracks or worse then the cold air blowing into your house might be coming straight from outside right into your ducts mixed in with the warm air your perfectly functional furnace is producing.

Furnace blowing cold air on heat. If your furnace is overheating that means your heat exchanger is getting too hot. Have an expert inspect your ducts along with the furnace. If your heater is blowing warm air but that air is venting into the attic or mixing with colder air from your attic then the net result will be that your heater is blowing cold air. One of the most common causes of a furnace blowing cold air is not actually.

Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. If you suspect a dirty air filter change the filter press the reset button if your furnace has one and see if your furnace begins to emit heated air. Check the furnace s air filter. If your furnace seems to be blowing cold air it could be a problem with the ignition system.

Clogged filter causes safety control shut off. If your furnace starts blowing warm but then quickly turns cold the flame sensor may need attention. Basically the furnace isn t lighting the fuel meaning it can t heat your home either. Change your furnace filters regularly pros recommend changing them once a month to ensure that your furnace continues to work properly.

Your furnace may be blowing cold air because the filter is too dirty. When overheating your furnace can trip a high limit switch causing the furnace burners to shut off so that the heat exchanger does not crack. This hot then cold air sequence happens over and over and your home isn t warming up. New high efficiency furnaces have what is known as a condensate drain.

When a heating cycle begins and your air handler turns on that cool air will blow out of your registers before warm air does. A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat. Auto ensures that the blower will run only when the furnace heats the air. So why is my furnace blowing cold air instead of heat.